Numerical Analysis Study On Internal Force And Deformation Of Deep Miscellaneous Fill Foundation With Pile Anchor Supporting

In recent years, expanding the scale of urban construction, construction projects often face deep fill foundation problems.Due to the composition of substances Fill foundation complex, backfill the difference in time, the particle size is uneven, with strong collapsible, and its mechanical properties have greater dispersion, and no rules, based on how fill foundation pit support, has attracted people’s attention. Different regions, different locations miscellaneous fill foundation is not the same, if not fully understand its particularity, and without proper engineering measures, it will bring to the project risks and issues.In this paper, according to Jinan Xiangtai Plaza miscellaneous fill pit anchor piles project as an example, based on field data analysis and numerical simulation methods such as, for miscellaneous fill pit theory of anchored piles, pile-anchor structure filled with miscellaneous interaction law of soil, miscellaneous fill pit areas by force deformation characteristics and numerical methods such as computed for the corresponding study, to provide a reference for future fill foundation of theory and engineering practice.Miscellaneous fill the venue through to the existing problems and the nature of the research project, compared to the existing miscellaneous fill support success stories, choice of anchored piles for processing. Adopt measures to reduce the grouting anchor reinforcement miscellaneous fill uneven ground, improve fill foundation of strength index, lower fill foundation compression, reducing the pit wall displacement and ground subsidence.Through the miscellaneous fill pile anchor retaining structure horizontal displacement, settlement, settlement building and the surrounding inner force anchor site monitoring data for analysis, summed up the general law. Because miscellaneous fill with porosity ratio, due to consolidation characteristics under applied prestressing loads, must be compressed, prestressing losses amounted to8%-12%; miscellaneous fill factor of safety pit and anchor the relationship between cable length is highly linear correlation; increase the depth of the excavation led to anchor anchoring force play increases; support under the same conditions, miscellaneous fill the top area of the settlement are quite different;80%horizontal displacement occurred in the fill soil; holistic fill soil at the interface with the original soil is poor, leading to the upper part of the overall support structure inside pit slip, causing the top of the pit near the ground crack.Simulation analysis using FLAC3D software, field trials and research methods of combining numerical simulation analysis of practical engineering constraints because no maximum unbalanced force, pile force, a single anchor axial force and so on. And miscellaneous fill the thickest section of the analysis, comparing the force changes miscellaneous fill grouting around the pile anchor bracing, and when the soil is not miscellaneous fill grouting, anchor prestressing severe losses, some anchor failure soil displacement large, does not meet the requirements of safety and distortion. When using anchor support in deep fill foundation must be reinforced to deal with miscellaneous fill to meet safety requirements and deformation.